As far as the Vivi Nova it is wonderful also, Its just has a a bit more of a learning curve because its an atomizer. PBusardo also has some good reviews and how to videos on the Vivi nova. It will also be less costly as all you need to do is buy the Nova and some extra heads and fill. There is a breaking in period, as with all attiys. Buy some cheap juice, or some plain Vg and Pg to practice with, it doesnt taste bad, and believe me, when I was learning to work with the Phiniac and the Vivi I wasted about 30-50 mls of juice. But I am clumsy.
Hmmm... I didn't really detect much of a learning curve with Vivi's. Were you using an older version? I've got five of the version 2.5's from Gotvapes and it's been pretty straight-forward for me. I just fill it up to the top of the gauge, wait for a minute or two for the wicks to completely soak, and then vape away. I haven't really noticed much of a change in flavor throughout the course of use, either. The only thing about them is that you have to invert it or twirl it when the juice gets down to the 1/3 mark or so, but I usually just refill it at that point unless I want to vape it dry so I can add a different flavor or do a clean or atty replacement.